D29101: KNewStuff: Fix file path and process call

[Alexander Lohnau]

alex added a dependent revision: D29123: Do not mark entry as uninstalled if uninstallation script failed.

REPOSITORY
  R304 KNewStuff

REVISION DETAIL
  https://phabricator.kde.org/D29101

To: alex, #knewstuff, ngraham, nicolasfella, elvisangelaccio, meven, mlaurent
Cc: kde-frameworks-devel, LeGast00n, cblack, michaelh, ngraham, bruns
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